Zennor purchased its 8.97% stake in the Britannia Field in 2018. Britannia, discovered in 1975 and on-stream in 1998, currently produces around 25,000boe/d gas-condensate from Lower Cretaceous sandstones via over 30 production wells. The purchase doubled Zennor’s net production and is linked to Zennor’s nearby Finlaggan development.
Block 211/23d contains the Causeway Field, discovered in 1992. It was developed as a subsea tie-back to the TAQA operated North Cormorant Platform, with first production in 2012. Production ceased in May 2016 and a formal COP notice is anticipated shortly.
Discovered in 2012, Cormorant East has produced oil from the Brent Sandstone since January 2013, over the nearby North Cormorant platform. The 2019 work programme included replacement of ESP’s in CN07. Following the well intervention the production is stable at ~700bbl/d with high uptime.
Licence P2452 contains the Murlach Field in block 22/24c of the Central North Sea. The Triassic oil reservoir was originally put on production between 2001 and 2005 from a single subsea well tied back to the ETAP infrastructure. The well produced over 10mmboe at rates of up to 15,000 boepd. Zennor, alonside operator BP, is working on a re-development of the Murlach Field, again subsea tied back to ETAP, uing 4D seismic data to target not only attic oil in the central block, but undrained volumes from the Southern extension of the Field. The FID decision is expected by H1 2020 with first Murlach oil production in 2022 and the field taking advantage of potential development synergies with the nearby Seagull development.
Licence P2402, block 30/19c, is located adjacent to the Skerryvore licence. Ruvaal, a Paleocene exploration prospect, boasts a Direct Hydrocarbon Indicator within the Mey Sandstone, similar to that seen over the Skerryvore feature.
Licence P2368 blocks 15/29e,30c, 21/4b,5b. This licence lies between Bacchus (P0255) and Finlaggan (P2013). The Fisher prospect is a seismically defined Fulmar Sandstone trap on the north slope of the Forties Montrose High. The prospect, likely to be oil prone,is best illustrated by the low noise GRT migrated seismic data that led to the development of Finlaggan.
Licence P2350 contains the Leverett discovery which stretches accross blocks 15/29c; 21/2d,3c,3d,4c. Zennor believes that 4 wells, all containing hydrocarbon bearing Lower Cretaceous reservoirs, define the Leverett accumulation. Ground breaking seismic migration leading to improved definition of the Lower Cretaceous reservoir, integrated with the knowledge gained from the sub-regional reservoir description and the results from the recent Finlaggan development drilling, gives Zennor the belief that Leverett makes an obvious follow on development opportunity to Finlaggan. With a reserve base similar to the ongoing development, Leverett could be “daisy chained” back through the Finlaggan infrastructure and on to Britannia for processing in a very capital efficient development scheme. Zennor is working towards a Financial Investment Decision on Leverett.
The Greenwell prospect also lies in Licence P2350. Greenwell is a mapped north-easterly extension of the Callanish Field. The prospect exhibits the same Direct Hydrocarbon Indicator as Callanish, a black-oil field with a Paleocene Forties reservoir that has produced 58 mmboe from four production wells over the nine years it has been in production. Zennor is working with the Callanish partners to determine how best to progress the drilling and subsequent development of Greenwell.
Licence P2397 contains the Courageous discovery in blocks 30/1e,2e. Alongside the Operator Ithaca, who also operate the nearby Stella facility, Zennor are working towards a development decision for this relatively complex discovery, which has significant volumes of hydrocarbons in place.
Licence P2400, blocks 30/12c,13c, 17h, 18c, is located around a salt diapir. The primary target is a large untested chalk anomaly underlying a Paleocene Direct Hydrocarbon Indicator within the Mey Sandstone, analogous to the Talbot Field immediately to the North. Parkmead operate the licence on behalf of partners Serica, Calenergy and Zennor.
Licence P2367 block 15/28a. This licence lies adjacent to Leverett (P2350). The Rutford prospect is a seismically defined feature exhibiting a Direct Hydrocarbon Indicator within the Lower Cretaceous Britannia sandstone. It represents a potential add-on to the Leverett development.